You may need to reach out to the local tournament director, registrar, or the assigned regional commissioners for a specific tournament.  Finding the contact information is easy.

You start with the Tournament lists on the NAGVA website:  https://nagva.org/tournaments.  Navigate to the tournament you are interested in.

On each tournament details page, you will find the local tournament's contacts on the upper-left side of the page.  Each of the names will have a link to start an e-mail with them.